here are 2 of the"proofs" of weed with too much " chems" in it: Sparking when burning and black ash. Black ash is caused by incomplete curing. The ash is black from burning sugars still in the bud. "sparking is caused by small stem pieces and / or spidermite ( or other critters in your buds... ) bodies exploding when the water in them vaporizes.!If there was enough magnesium in your bud, as people try to claim, it wouldn't spark, it would burst into flame!